Damaging winds, destructive storm tides and major flooding are forecast for WA's Pilbara coast as Cyclone Veronica bears down as a category four severe tropical storm — and it's set to intensify even further.

Staff at a medical centre in Perth's southern suburbs find a baby boy less than 24 hours old covered with a blanket in a box but in good health outside their building, with police appealing for help to find his mother.

A judge says "graphic" pornography found on a computer at the Perth home of Bradley Edwards cannot be used as evidence against him, but rejects a defence bid for some of his charges to go to a separate trial.

The Bureau of Meteorology predicts Cyclone Veronica will strengthen into at least a category four tropical storm before reaching WA's Pilbara coast over the weekend, threatening communities from Port Hedland to Exmouth.

In foster care since they were infants, Aboriginal toddlers Gracie and Lylah are in the hands of white carers — who say connecting the children to their heritage and breaking down barriers remain challenging.

Former AFL rising star Rhys Palmer remains in and out of an induced coma after having his spleen removed following a motorcycle crash in Perth, but does not have any head or spinal injuries, his football club says.